Protection of entanglement for a two-qutrit V-type open system on the basis of system-reservoir bound statesBahram Ahansaz, Naghi Behzadi and Esfandyar FaiziEur. Phys. J. D, 73 3 (2019) 54DOI: https://doi.org/10.1140/epjd/e2019-90402-0